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DES-7200 Configuration Guide Chapter 10 MSTP Configuration
10-18
Caution
1) When the AutoEdge function conflicts with the
manually-configured Port Fast function, the latter shall prevail.
2) AutoEdge function can be used for rapid negotiation
forwarding between the designated port and the downstream
port, so the STP protocol doesn’t support AutoEdge. If the
designated port is in the forwarding status, Autoedge does not
take effect on the port. It will take effect during repaid
renegotiation such as pluging/unpluging network cables.
3) If a port enables the BPUD Filter, it forwards the BPDU
message directly, but not be identified as the edge port
automatically.
4) AutoEdge function is only applicable for the designated port.
5) AutoEdge complies with the standard definition of IEEE
802.1D (version 2004), in which the parameter range of Bridge
Hello Time has been modified as 1.0-2.0. Therefore, you shall
confirm that the Hello Time value is within the range when using
AutoEdge function, or the risk of temporary loop will occur. It is
recommended to disable AutoEdge function if it is neccesary to
exceed the range of Hello Time.
10.2.3 Understanding
BPDU Guard
The BPDU guard can be enabled globally or on individual interface. There are
some slightly difference between these two ways.
You can use the spanning-tree portfast bpduguard default command to open
the global BPDU guard enabled status in the global configuration mode. In this
status, if the BPDU message is received through a Port Fast-enabled port or a
AutoEdge port, this port will enter the error-disabled status, indicating the
configuration error. At the same time, the port will be closed to show that some
illegal users may add a network device to the network, which change the
network topology.
You can also use the spanning-tree bpduguard enable command to enable
BPDU guard on individual interface in the interface configuration mode (it is not
related to whether it is AutoEdge port or not ). Under this situation, it will enter
the error-disabled status if this interface receives the BPDU message.